diff --git a/headers/posix/fcntl.h b/headers/posix/fcntl.h
index fa6f0a307d..591565b80b 100644
--- a/headers/posix/fcntl.h
+++ b/headers/posix/fcntl.h
@@ -64,11 +64,13 @@
 #define O_SHLOCK		0x01000000	/* obtain shared lock */
 #define O_EXLOCK		0x02000000	/* obtain exclusive lock */
 
+#ifdef B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT
 #define AT_FDCWD		(-1)		/* CWD FD for the *at() functions */
 
 #define AT_SYMLINK_NOFOLLOW	0x1		/* fstatat(), fchmodat(), fchownat(),
 										utimensat() */
 #define AT_SYMLINK_FOLLOW	0x2		/* linkat() */
+#endif
 
 /* advisory file locking */
 
@@ -89,7 +91,9 @@ extern int	creat(const char *path, mode_t mode);
 extern int	open(const char *path, int openMode, ...);
 	/* the third argument is the permissions of the created file when O_CREAT
 	   is passed in oflags */
+#ifdef B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT
 extern int	openat(int fd, const char *path, int openMode, ...);
+#endif
 
 extern int	fcntl(int fd, int op, ...);
 
diff --git a/headers/posix/sys/stat.h b/headers/posix/sys/stat.h
index 530f53e64d..6f7ee499a5 100644
--- a/headers/posix/sys/stat.h
+++ b/headers/posix/sys/stat.h
@@ -110,7 +110,9 @@ extern int		fchmod(int fd, mode_t mode);
 extern int		stat(const char *path, struct stat *st);
 extern int		fstat(int fd, struct stat *st);
 extern int		lstat(const char *path, struct stat *st);
+#ifdef B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT
 extern int		fstatat(int fd, const char *path, struct stat *st, int flag);
+#endif
 extern int		mkdir(const char *path, mode_t mode);
 extern int		mkfifo(const char *path, mode_t mode);
 extern mode_t	umask(mode_t cmask);
diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index 3b9c55c4e7..e5107b0e5a 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -138,8 +138,10 @@ extern int		unlink(const char *name);
 extern int		rmdir(const char *path);
 
 extern ssize_t  readlink(const char *path, char *buffer, size_t bufferSize);
+#ifdef B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT
 extern ssize_t	readlinkat(int fd, const char *path, char *buffer,
 					size_t bufferSize);
+#endif
 extern int      symlink(const char *from, const char *to);
 
 extern int      ftruncate(int fd, off_t newSize);
diff --git a/src/system/libroot/posix/fcntl.cpp b/src/system/libroot/posix/fcntl.cpp
index 886025b32d..23aeebccf3 100644
--- a/src/system/libroot/posix/fcntl.cpp
+++ b/src/system/libroot/posix/fcntl.cpp
@@ -7,6 +7,9 @@
  */
 
 
+#define B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT 1
+	// make the *at() functions and AT_* macros visible
+
 #include <stdarg.h>
 #include <unistd.h>
 #include <fcntl.h>
diff --git a/src/system/libroot/posix/sys/stat.c b/src/system/libroot/posix/sys/stat.c
index 15cf9e8e99..de266a1727 100644
--- a/src/system/libroot/posix/sys/stat.c
+++ b/src/system/libroot/posix/sys/stat.c
@@ -4,6 +4,9 @@
  * Distributed under the terms of the MIT License.
  */
 
+#define B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT 1
+	// make the *at() functions and AT_* macros visible
+
 #include <syscalls.h>
 
 #include <sys/stat.h>
diff --git a/src/system/libroot/posix/unistd/link.c b/src/system/libroot/posix/unistd/link.c
index 9925154aa1..a2126cdb08 100644
--- a/src/system/libroot/posix/unistd/link.c
+++ b/src/system/libroot/posix/unistd/link.c
@@ -4,6 +4,9 @@
  */
 
 
+#define B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT 1
+	// make the *at() functions and AT_* macros visible
+
 #include <unistd.h>
 #include <errno.h>
 #include <syscalls.h>